CPC Main Group
C09K 13/00 Etching, surface-brightening or pickling compositions (for glass C03C15/00, ; for metallic material C23F, C23G1/00, C25F1/00; )
3 direct subcodes
Child Classifications
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- C09K 13/02 containing an alkali metal hydroxide
- C09K 13/04 containing an inorganic acid
- C09K 13/12 containing heavy metal salts in an amount of at least 50% of the non-solvent components
Top Applicants
Top 10 applicants by patent filingsfor class C09, 2013–2023, worldwide · Source: EPO PATSTAT
- LG CHEM KR 7,954
- HALLIBURTON ENERGY SERVICES GROUP US 6,584
- NITTO DENKO CORPORATION JP 6,500
- 3M INNOVATIVE PROPERTIES COMPANY (MINNESOTA MINING AND MANUFACTURING INNOVATIVE PROPERTIES COMPANY) US 6,490
- DOW GLOBAL TECHNOLOGIES US 6,324
- FUJIFILM JP 5,832
- MERCK PATENT DE 5,481
- BASF (BADISCHE ANILIN & SODA FABRIK) DE 5,147
- SAMSUNG DISPLAY KR 5,105
- NITTO DENKO CORPORATION 3,584